The idea that the motion of the observer changes the wavelength of the incoming light is too idiotic, even by the standards of the Einstein cult, so Einsteinians don't discuss it explicitly (there are exceptions of course). On the other hand, the idiocy is life-saving. If the motion of the observer does not change the wavelength of the incoming light (which is more than obvious), the speed of light relative to the moving observer is VARIABLE and modern physics collapses. The danger is so great that some Einsteinians lose control of themselves and attribute the idiocy to sound waves as well:

http://bretagnemontagne.files.wordpress.com/2011/02/23.jpg

Professor Martin White, UC Berkeley: "...the sound waves have a fixed wavelength (distance between two crests or two troughs) only if you're not moving relative to the source of the sound. If you are moving away from the source (or equivalently it is receding from you) then each crest will take a little longer to reach you, and so you'll perceive a longer wavelength. Similarly if you're approaching the source, then you'll be meeting each crest a little earlier, and so you'll perceive a shorter wavelength. [...] The same principle applies for light as well as for sound. In detail the amount of shift depends a little differently on the speed, since we have to do the calculation in the context of special relativity. But in general it's just the same: if you're approaching a light source you see shorter wavelengths (a blue-shift), while if you're moving away you see longer wavelengths (a red-shift)." http://w.astro.berkeley.edu/~mwhite/darkmatter/dopplershift.html

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